today, the libyan government which has close relationships with the united states. apologized. and there was a pro-american demonstration in benghazi, but elsewhere in the region there were anti-american protests. in tunisia, in gaza, the protests continued in front of the u.s. embassy. friday. this is the dark side, brian, of the arab spring movement which empowered many looking for democracy, but also unleashed a great many radicals without the strongmen keeping them in check. there could be more incidents like this in the days, months and years to come. >> all right, richard engel starting off our coverage, now the response to the crisis, taking place on several fronts. we'll get to the political part of it. first, with us our chief foreign correspondent, andrea mitchell, with more on the response and much more on the dedicated american diplomat, who again has been killed on the job. andrea, good evening. >> reporter: good evening, the president consoled the grieving, saying that no act would shake the resolve on a great nation. barack obama vowed to bring the killers to jus